Device for removing pump liners and valve seats



Jan. 19 1926.

' B. H. DAVIS DEVICE FOR REMOVING PUMP LINERS AND VALVE SEATS FiledApril 12, 1923 Patented Jan. 19, 1926.

UNrrEo STATES 1,570,338 PATENT OFFICE,

BERNARD H. DAVIS, 01' FULLERTON, CALIFORNIA.

DEVICE FOR REMOVING PUMP LINERS VALVE SEATS.

Application filed April.12, 1923. Serial no. 631,739.

To all whom it may concern:

. Be it known that I, BERNARD H. DAVIS, a citizen of the United States,residing at Fullerton, in the county of Orange andv State of California,have invented new and useful Improvements in Devices for Removing PumpLiners and Valve Seats, of which the following is a specification.

My present invention is an improved device for removing the liners andvalve seats of pumps, and particularly those pumps that are utilized forpumping mud, sand, or

' the like from oil Wells, the principal objects of my invention beingto provide a relatively simple, practical device that may be readilyinserted within a pum-p cylinder or valve seat, or the like, and which,when properly manipulated, will readily unseat the liner or valve seattherefrom.

It will be understood that pumps that are utilized for pumping mud,sand, and

the like from well holes are commonly provided with removable liners,these being ordinarily straight cylinders, and with. removable seats forthe valves, these seats being ordinarily slightly tapered. The mentionedremovable parts, and also bushings' and similar elements, which mayhereinafter be referred to simply as lining elements, very frequentlybecome rusted into a pump,

' with the result that much time and labor have heretofore been involvedin removing these parts when the same have become so worn as to renderthem unfit for further.

service. 4 g

It is an object of my invention to provide a relatively simple devicecomprising parts which may be easily and quickly engaged on the innerend of a lining element to withdraw the same from its working positionwithin a pump, or the like, and which may also be used to put a new orold liner into position.

It is a further object of my resent invention to provide means of t egeneral character, referred to which, although it may utilize theprinciple of the screw as well as that of the wedge in effecting anengagement of parts, shall neverthelem be, after its liner-engagingparts are properly disposed relatively to the liner element, entirelfree from any wedging effect tending to dlstort such liner element, ortending to y increase the frictional'engagement between any liningelement which is to be removed andany outer tube or shell within whichit may have been seated.

It is a further object of my invention to provide a ruggedtool, whichmay preferably comprise ball-bearings, adapted to be made 00 instandardized sizes, the work-engaging or grapple parts of my pullersbeing preferably of such configuration as to be easily collapsible forinsertion through a liner element and adapted to be thereafter expandedI into a substantially cylindrical form, with projecting lugs or flangesengaged beneath or beyond the back of the liner element which is to beremoved, it being a merit of my preferred design that the wedgingelement by which my grapple is expanded may be at all times housedsubstantially therein, so that only a very limited bottom clearance(corresponding to the thickness-of the mentioned lugs or flanges) isrequired to permit the engagement of said lugs or flanges.

Other objects of my invention will appear, from the following descrition of a preferred embodiment thereof: appended claims, taken inconnection with the accompanying drawings, in whic Figure 1' is avertical section, with parts broken away, showing the relative positionof parts of a puller of my design as the 8 detail to the parts of thosemy invention which I have chosen for purposes of illustration, 1 may beregarded as a pump cylinder, or the like, provided with a liner 2, whichis to be removed, and the essential parts of, my improved device for theremoval thereof will now be described. A spanning element or oke 3,which may be a casting rovided with a central aperture 4 and a she der5, is adapted to receive a drawbar $3 provlded at and from the 39 bottomof a 9 showone end with means for imparting movement thereto, such asthe tightening nut 7, and at the other end with a grapple of noveldesign, any preferred type of ball-bearings, or the equivalentcomprising rolling elements, being optionally provided in the form of acollar 8, adapted to engage respectively the shoulder 5 and the nut 7,or the equivalent, this nut being shown as having a threaded engagementwith the drawbar 6, and the respective legs of the spannin element 3being adapted to engage the cyllnder 1, from which the liner 2 is to beremoved.

To eflect the removal of the mentioned liner, or the removal of'a valveseat in the manner suggested in Figs. 5 and 6, I prefer to employ agrapple element comprising relatively swinging parts 9, shown as-pivotedtogether at 10, and as adapted to be collapsed sufliciently to permitinsertion through a liner, in the manner shown in Fig. 1, these swingingparts being provided with inclined inner surfaces 9, adapted to beengaged by ahead 11 upon the end of the drawbar 6, the upper edge of thesubstantially cylindrical head 11 being preferably tapered, beveled orrounded, to facilitate its movement relatively to the inclined surface9, in order that by a pull upon the drawbar 6, the head 11 may beeffective to wedge the swinging elements 9 apart, in the manner shown inFigs. 2 and 5, so that the lugs or flanges 12, upon the lower ends ofsaid swinging elements, may efi'ectively engage under the bottom. of aliner element, in readiness for the withdrawal of the same. As will beobvious from an inspection of Fig. 2, the first effect of the upwardmovement of the head 11 is a relative expansion of the swinging elements9; and when these elements are expanded into a substantially cylindricalform, or into another form suitable to the interior configuration of aliner element which is to be removed, the body of the head 11 beingadapted to interfit therewith, no further wedging effect can be producedby further tension upon the drawar; but since the upper ends of theswinglng elements 9 are respectively provided with abrupt or undercutshoulders 13, adapted to en age with a corresponding or substantiallyflit surface upon a correspond- 1ng shoulder T, located at the upper endof the head 11, a further u ward movement of the drawbar 6 can be eective only to draw a lining element from its 'seat. By continuedrotation of the nut 7 upon the drawsame with bar, a lining element,having been loosened or unseated in .the manner described, may becompletely wiithdrawn.

I When a grapp e of my im roved desi is to be used for the unseating ofcylind i ihal 1111618 only, it is not necessary to provide the slotssuch as are shown at N; but, when a valve seat 14 of the character shownin-Figs. 5 and 6 is to be withdrawn, such avalve seat being providedwith integral transverse webs 15, it will be understood that thementioned slots N will serve to allow clearance for the mentioned webs,permitting the lugs or flanges 12 to engage under the valve seat and tobecome effective in the withdrawal of the same. As best shown in Figs. 1and 2, the bottom of the head 11, which is integral with or secured tothe drawbar 6, may be provided with a concavity 15?, to provide room forparts of, or for elements associated with the valve seat 14, it beingunderstood that any desired minor changes may be made in the design ofparts in order to adapt them to a particular use.

As will be obvious from an inspection of the figures, it is intendedthat the parts above mentioned shall be -so proportioned that, when thehead 11 shall be positioned substantially as shown in Fig. 1, the entiregrapple is so collapsed that no. diameter thereof shall exceed theinternal diameter of the liner element which is to be withdrawn thereby;but that whenever this head is drawn into substantially the positionshown in Fig. 2, it shall be operative to effect an expansion of theswinging eles ments 9 into the form of a cylinder, or into other formadapted to fit within a liner element without producing lateral pressurethereon; and since the head 11 is adapted to permit a collapse of theentire grapple while confined therein, it will be obvious that, in orderto permit of the positioning of a grapple of my preferred design, thereis need of only sufiicient clearance, beneath a liner, to permit theinsertion of the lugs or flanges 12, the onl effect of a subsequentadvance of the draw ar 6': being the lifting .of a liner element fromits seat.

In that form of my invention which is shown in Figs. 5 and 6, it will benoted that the head 11 is virtually a frustum of a cone, but in thisform also I provide a shoulder 1; having a flat top adapted to contactwith the shoulders 13 upon the in terior of the swinging elements 9.

Although I have described but two embodiments of my present invention,it will be understood that various features thereof may be independentlyused, and that various modifications may be made therein withoutdeparture from the spirit and scope of my invention as the same isindicated above and in the following claims; and also that my pullersmay: be used not only to remove liners but also to draw them into place(the drawbar 6 then extendin through, for (example, the opening 16) anfor any other desired purpose.

' What I claimvis: 1':

1. A puller comprising *a drawbar, a grapap pose about the drawbar, ahead fored e formed of swinging elements dis straight surfaces of saidelements, and means for pulling the drawbar causing said head to engagesaid tapered surfaces to expand said swinging the straight be ofswinging elements pivote to each other elements and then to engagesurfaces, whereby the grapple may pulled by the drawbar withoutfurtherexf interior of the grap le,

v be engaged by sai anding said elements. v v

2. A' puller comprising a drawbar, a grapple formed of swinging elementsdis-' posed about the: drawbar, a head formed 'upon' the drawbar andnormally disposed within the grapple, there being frusto-conical andcylindrical surfaces formed upon the and means for pulling u on the drawar, whereby said head may rst engage the frusto-conical' surfaces toexpand the grapple and then engage the' cylindrical surfaces whereby thegrapplemay be pulled by the drawbar without further expandingthegrapple.

3. A puller comprising a drawbar, a rapple disposed about the drawbar, ahea ormed'upon the drawbar and normally disposed within said grapple,said grapple aving interior tapered surfaces adapted to (1 head, meansforming an abutment for'the head adjacent the top of the ,grapple, andmeans drawbar whereby said head may be .caused to engage said taperedsurfaces to expand ment, a draw bar ada through said spannmg element,

gageable by about said draw bar. for pulling said the grapple and thenengage the abutment, whereby the apple may e drawbar .wit out furthergrapple. 7

4.- A puller comprising formed u on the drawbar,

expanding the a drawbar, a head arapple formed being tapered sur-.grapple engageable by said head to expand and means forming an abut--said tapered drawbar is the grapple, ment upon the grapple abovesurfaces whereby when the then pulled by t e drawbar upon engagementbetween said head and said abutment.

5. A puller, comprising a spannin eleted to be with rawn adapted to 'be'rotated upon said draw bar for withdrawing the draw bar from saidspannin element, an antifriction bearing dispose bar, a grapple=composedof swinging elements having ta red interior. surfaces ensai head, saidswinging elements being pivoted together and secure In testimony whereofI have signed my name to this specification.

' BERNARD H. DAVIS.

means with-in said means and said s an d mng element, a head carried bysaid raw pulled by-the pulled, the grapplle will be expanded and

